Detailed explanation of common Linux commands

Detailed explanation of Linux netstat command:
http://www.cnblogs.com/ggjucheng/archive/2012/01/08/2316661.html

Detailed explanation of Linux lsof:
http://blog.csdn.net/guoguo1980/article/details/2324454

Linux Detailed explanation of awk command:
http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858470.html